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Communication interfaces ➜ Fig. 7
Ext. Off
Remove the converter bridge before connecting the Ext. Off inter-
face.
Input for potential-free NC contact
Version:
Open circuit
max. 12 V
voltage:
approx. 10 mA
Loop current:
NOTICE
Ext. Off function for twin-head pump opera-
tion
The Ext. Off function of the master applies to the en-
tire twin-head pump (main and standby pump). The
Ext. Off interface of the standby pump must be
bridged!
NOTICE
The connection cable at Ext. Off must be < 30 m.
Collective fault signal (SSM)
The contact of the collective fault signal (potential-free normally
closed contact) can be connected to a building automation system.
24
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Contact load:
Collective run signal (SBM)
The contact of the collective run signal (potential-free normally
open contact) can be connected to a building automation system.
Contact load:
Dual pump management
Interface between two pumps acting together as a twin-head
pump.
The role of the master can be set with the DIP switch ➜ Fig. 8.
DIP switch position "ON" = Master
Interface:
Voltage:
Frequency:
Cable length:
Permitted minimum: 12 V AC / DC, 10 mA
Permitted maximum: 250 V AC, 3 A, AC1 /
30 V DC, 3 A
Permitted minimum: 12 V AC / DC, 10 mA
Permitted maximum: 250 V AC, 5 A, AC1 /
30 V DC, 5 A
DANGER
Electric shock!
Danger to life through voltage transmission, if mains
and SSM pipe are led together through a 5-wire
cable.
Wilo-specific, sustained short circuit protec-
tion
max. 10 Vss
2.4 kHz
< 3 m
WILO SE 2020-04
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